Sorry if this has alrady been posted. I have a problem blowing the 50 amp fuse on my 1984 OMC Stern Drive I/O. The list of things I have to check are 1. electric motor (brushes may be stuck) 2. clean the two wire rings that feed the two 50 AMP fuses. 3. Clutch plate (?) 4. worm gear (?). Not...